First, I'm not convinved I'm right or I'm wrong . I have nothing to back my statements up other than how I interpret my experiences.
Maybe it's semantics but I don't consider skidding and slidding the same. Slidding, like in doing a side slip, is difficult for novices not matter the ski. A race ski would definitely make it harder. Especial something with a .5 base edge.
Since GS race skis usually have less side cut than an all mountain ski, I dont' see how it would be harder for them to skid; slide yes but not skid. Yes it would be stiffer and be less forgiving, but they should be able to skid.
If you are slidding down the fall line, you are trying to keep your down hill edge from catching and your uphill edge from catching too much if at all.
If you are skidding down the fall line, you are trying to dig you up hill edge in and your down hill edge is way up.
Please explain where I'm wrong on this. Again, originally I made my statements about novice skiers (I misinterpreted what the OP was asking) getting better and not Advanced skiers.
I did try a post where we clear up vocabulary and jargon and differentiate between semantic issues and definitions, but it fell flat.
Skidding is no word that pertains to ski technique. Skidding would be, if the word were ever used, when you hit a patch of ice and lose all control of your edges. Sliding has to do with pressuring and releasing your edges by degree, along the edge tip to tail. The more sidecut and the more stiffness, the more difficult to slide the ski for scrubbing speed type maneuvers, thus the concept by Dynastar to reduce sidecut in the tail portion of the ski to make it both carve well and release, slide, well. We digress into stuff that may belong in the instruction, technique forum, sorry. As relates to ski shape and properties, there is some pertinence here.